docs: create weekly documentation drift report [2026-06-28]

[jgoldfoot]

This PR introduces a new weekly documentation drift report named Documentation drift report [2026-06-28].md. It compares the definitions, principles, citations, and numbers across README.md, docs/whitepaper.md, examples/ssr-pass-example.html, and tools/validators/fr1-checker.js using the requested labels (QUESTION and VARIATION) and formatted by artifact pair with inline quotes.

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PR created automatically by Jules for task 5792691738856090982 started by @g0ldf7

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